LLM Comparison

Sonar Reasoning Pro vs GPT-5.4 Nano

Side-by-side specs, pricing & capabilities · Updated April 2026

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2/6 models

Same tier:

	S Sonar Reasoning Pro	GPT-5.4 Nano
Organization	Perplexity AI	OpenAI
OpenTools Score
Family	Sonar	GPT
Status	Current	Current
Release Date	Mar 2025	Mar 2026
Context Window	128K tokens	400K tokens
Input Price	$2.00/M tokens	$0.20/M tokens
Output Price	$8.00/M tokens	$1.25/M tokens
Pricing Notes	—	Cache read: $0.0200/M tokens
Capabilities	textvisioncodeextended-thinking	textvisioncode
Max Output	—	128K tokens
API Identifier	`perplexity/sonar-reasoning-pro`	`openai/gpt-5.4-nano`
Benchmarks
MMLU	83	—
	View Sonar Reasoning Pro	View GPT-5.4 Nano

Cost Calculator

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Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
GPT-5.4 NanoCheapest	$0.20	$0.63	$0.83	—
Sonar Reasoning Pro	$2.00	$4.00	$6.00	+627%

Perplexity AI

Sonar Reasoning Pro

Sonar Reasoning Pro is a multimodal llm from Perplexity AI. Supports up to 128,000 token context window. Achieves 83.0% on MMLU. Available from $2.00/M input tokens.

OpenAI

GPT-5.4 Nano

GPT-5.4 Nano is a multimodal llm from OpenAI. Supports up to 400,000 token context window. Available from $0.20/M input tokens.